NDR vs NRR
NDR (Net Dollar Retention) and NRR (Net Revenue Retention) are two names for the same metric: revenue retained from an existing cohort including expansion, net of churn and contraction. There is no calculational difference — only house style.
Formula
Worked example
Snowflake's S-1 reported "net revenue retention rate" of 158%; many US investors would call the identical figure NDR. Same maths, same cohort logic, different label.
US public filings lean towards NDR or "dollar-based net retention"; operators and European teams more often say NRR. Occasionally a company defines its variant over a trailing twelve months or on ARR rather than MRR — the window and base matter far more than the initialism.
When comparing companies, check three things: the measurement window (monthly, quarterly, TTM), whether the base is MRR or ARR, and whether reactivated customers are included. Two "120% NDR" companies can be meaningfully different underneath.
Compute it: NRR calculator